butt-crack:

Informal designation for the crevice separating the buttocks .
Synonyms: ass-crack ; backeye-slice ; backeye-slit ; broad-smile ; brownsward ; bum-cleavage ; crack ; crease ; crevice ; foul-line ; reverse-cleavage ; split ; vertical-grin ; valley .

Quote: Romy Weinberger (Lisa Kudrow) to Michelle White (Mira Sorvino) in Romy and Michelle's High School Reunion (1998): 'This underwear is totally riding up my butt-crack' .

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